I have a Onkyo tx-sr501 receiver and I was wondering if anyone else notices this. When I choose the DTS soundtracks on some of my DVDs, I have to turn the volume up louder than I do on the DD EX. Is there an explanation for this? And DTS material just seems not to be as vibrant of a sound as the DD soundtracks on my onkyo. Some of the DVD's that I have noticed this on include: LOTR, The Two towers Gladiator Just to name a few. This seems to be across the board when I listen to 6.1 DTS material.